Sheet sensor for use with a drum

Details Sheet sensor for use with a drum Sheet sensor for use with a drum

1998-02-26

2000-04-11

Ellis, Christopher P.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

400708, 400711, B41J 2918

Patent

active

060479612

ABSTRACT:
A sheet sensor arrangement for a sheet printing machine and particularly for a turning device of a sheet printing machine, which comprises at least one hollow cylindrical drum (3; 4), which has a gripper system to transport and/or temporarily store individual sheets (5). A sensor arrangement which is not very susceptible to contamination and has a mechanically simple structure is comprised of the fact that the cylindrical wall of the drum (3; 4) has at least one opening which allows light to pass through, and that a sheet sensor is formed by a light barrier (9, 10, 11), which has a light beam which, in at least one angle position of the drum, is directed from the inside at the opening which allows light to pass through. In addition, a corresponding process for optical monitoring of sheets in a sheet printing machine is indicated.

REFERENCES:
patent: 4777509 (1988-10-01), Komatsubara et al.
patent: 4778296 (1988-10-01), Takahashi
patent: 4867592 (1989-09-01), Cranford
patent: 5598201 (1997-01-01), Stodder et al.
patent: 5725321 (1998-03-01), Brannan et al.
patent: 5732944 (1998-03-01), Mayer
patent: 5944431 (1999-08-01), Becker et al.

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